Hi all,
I think I'm having a real serious problem now ;)

I build a programmer and a separate test board for the 16c84.
Programming went well, but testing doesn't. The program in the Pic is the
famous flashing led.

The problem seems to be the crystal. It doesn't oscillate very well.

I have been working on this problem for 2 weeks now, and I get kind of
desperate ;(
Please let me now if you have a probable solution!

Here are the facts:

- my scope shows a mildly distorted sine wave between osc1 and osc2 (pin
15/16).
- when I connect the scope -> it works
The scope has R=1M and C=33pF -> when I replace the scope with a R (1m)
between pin 15 and 16 and parallel to that, a C (33pF)
no result.
- when I touch the GND side of the caps with my fingers, sometimes the led
flashes up.
- The R (10 Ohm) is implemented to reduce the current through the crystal.
replacing it by a wire doesn't make a lot of diffenrence, it seems.
- I tried several crystals (4 MHz) -> No go.

- connection:

        GND
       __|__
     _|      |_
     _       _ 2x C=47pF
      |       |
      |_|X|_|
      |      |_
      |     |  | R=10 Ohm
      |     |_|
      |16   |15
   _ |____|______
   | Pic 16c84    |
   ---------------------

Thanx,
John